>>> personal appeal. first lady michelle obama's speech to the democratic national convention aims to inspire voters to re-elect her husband. >> barack knows what it means when a family struggles. he knows what it means to want something more for your kids and grandkids. barack knows the american dream because he's lived it. >>> rejecting romney. san antonio mayor julian castro uses the convention's keynote address to make the case against the gop ticket. >> their theory has been tested. it failed. our economy failed. the middle class paid the price, your family paid the price. mitt romney just doesn't get it. >>> election violence in canada. quebec's newly elected premier is pulled off stage after a deadly shooting at her victory rally. >>> the seal's story. one of the elite commandos who took out osama bin laden tells scott pelley about the mission and how it almost failed. >> at this point, i was pretty sure we were going in. >> going to crash? sure we were going in. >> going to crash? >> yeah. captioning funded by cbs >>> this is the "cbs morning news" for wednesday, september